VBrick Systems VB4000, VB6000, VB5000 manual MBR Troubleshooting

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This feature is useful when you want to configure MBR on the appliance with a high bit rate group for LAN HTTP access and at the same time have a server pull a low bit rate group for reflecting. You can also use it to test playback for a particular group. MBR groups are configured on the Configuration: Encoder > Server pages. When configuring audio and video MBR groups on the Configuration: Encoder > Server page (Figure 4), keep the following group configuration rules in mind.

Table 7. Group Configuration Rules

•The first video encoder (Video Rate1) is always enabled and available for selection; the first audio encoder (Audio Rate1) is always enabled and available for selection.

•Different enabled audio encoders must have different audio rates. Different enabled video encoders must have different video rates.

•An enabled group must have at least one stream selected.

•All enabled groups must have the same combination of audio and video. For example, if one group is configured for video and no audio, they must all be configured for video and no audio. There are three ways to configure the groups:

•audio and video

•audio, no video

•video, no audio

•A particular video or audio rate may appear in more than one group but two groups cannot have the same audio, video, and closed caption selections.

•Closed Caption and Meta Data can be selectively turned on or off for each group but a

group cannot contain only Closed Caption and Meta Data.

•Group1 is the default group which will be played by older versions of the Windows Media Player that do not support MBR serving.

Note The Windows Media Player determines which bit rate stream to use and communicates this information back to the appliance or the server in a negotiation process that is transparent to end users. With MBR intelligent streaming enabled, the Windows Media Player generally responds to insufficient bandwidth by requesting a lower bit rate from the server. Window Media Player Version 7.1 or higher is required to play MBR streams or files. Older versions of the player may not support MBR but will be generally able to play the default group from an MBR stream or an archived

.wmv file.

MBR Troubleshooting

The Windows Media Player does not support ASF Group Exclusion or Mutual Exclusion mechanisms so the VBrick Appliance cannot guarantee that the player will always make stream selections that match up with the configured groups. To work around this player issue, the VBrick uses a "closest match" approach to avoid playback problems whenever possible. For example, if the VBrick is configured with Groups that are all video+audio and the player requests video-only, the VBrick will send the lowest rate group that contains the video rate the player requested. When this happens, the player will accept and play the closest match stream, even though the rate of the stream is higher than the player expected and the viewer will hear audio along with the video. This closest match approach is used by the VBrick anytime the player requests video-only, audio-only, or CC/metadata-only and there is no

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© 2008 VBrick Systems, Inc.

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Contents VB4000-5000-6000 Series Network Video Appliances Copyright Contents SDI Configuration StatusMaintenance Mode DiagnosticsMaintenance WM TemplatesStream Prioritization IndexWM Admin Guide OrganizationGetting Help Getting the Best VideoFont Conventions Printer-FriendlyPreface System Requirements for Windows Media Player OverviewTopics in this chapter Typical VBrick Applications Standard FeaturesStandard Feature Encoder Reflector Http TCPApplication Description VBricks Streaming EcosystemMulticasting UnicastingVBrick Reflecting ReflectingReflecting from VBrick Appliances Push ReflectingPush Reflecting from a Windows Media Server Pull ReflectingPull Reflector Type MBR Output Streams Using Multiple Bit Rate StreamsOther Considerations Configurable Input/Output Stream Rates WM Output Streams Output DescriptionShared Video Settings Independent Video Settings MBR Output SettingsHTTP/RTSP Shared Audio Settings Independent Audio Settings MBR GroupsMBR Troubleshooting Using On Demand Playback Optimizing System Performance Mixed Model AppliancesArchiver and Recorder Functionality Archiver/Recorder FunctionalityVBrick Systems, Inc WM Configuration Configuration Network Configuration Network EthernetDomain Name Server Numbers or hyphensConfiguration Network Routing Network Time SynchronizationWM Configuration Configuration Network Management Template Name Description Configuration EncoderConfiguration Encoder Template LANConfiguration Encoder Video Windows Media Encoder Video -- Slot1 SvidVBrick Systems, Inc Reduces the saturation Settings to allow this Tools Options Security Run Script Video Template Settings -- Slot1 Video Rate1 Video Rate1 Video Rate2 Video Rate3Video Rate1 Video Rate2 Video Rate3 WM Configuration Configuration Encoder Audio Audio Template Settings Bit Rate and Sample Frequency Stereo MonoConfiguration Encoder Multicast Windows Media Encoder Multicast -- Slot1 Multicast Playback NSC File Information -- Slot1Configuration Encoder Announce SAP Windows Media Announce Common Information -- Slot1 Bit mask. This string is simply another keyword you can use Configuration Encoder Server Announce Program Guide SAP for Multicast -- Slot1Windows Media Encoder Server -- Slot1 HttpHttp URL RtspuRtspu URL Unicast Playback Rtsp UDPAnnounce Http and Rtspu Server Rtspu SAP Http SAPRtsp URL ASX Rollover Announce External Server -- Slot1Creating Publishing Points Creating Publishing Points on Windows Media ServersCreating Non-Authenticated Push Publishing Points Creating Publishing Points on Helix Universal ServersConfiguration Encoder Archiver Creating Pull Publishing PointsWM Configuration Windows Media Archiver -- Slot1 FirmwareWM Configuration FTP Server Enable Progressive DownloadConfiguration Encoder Push Http Push Slot1VBrick Systems, Inc Configuration Reflector Configuration Reflector Source Push ReceiverPull Receiver ASX Microsoft Server on-demandPulling MBR Streams Pulling VOD Files from a Microsoft WM ServerConfiguration Reflector Multicast Configuration Reflector Announce SAPConfiguration Reflector Server Configuration Reflector Archiver Configuration Reflector Push Configuration Jpeg Jpeg Configuration Jpeg FTP Configuration Jpeg Capture ConstraintsConfiguration FTP File Transfer Servers Configuration FTP File TransferModel Jpeg Configuration Max Clients † FTP Server Configuration FTP File Transfer Transfers FTP StatusHard Drive Status Configuration PassthroughFTP Queue Operation Configuration Passthrough COM1 Passthrough State ResponderPassthrough State Initiator WM Configuration Configuration System General Configuration SystemConfiguration Passthrough COM2 SystemConfiguration System Snmp Traps Front Panel LCD DisplayProgram Files\VBrick\VB6000\Download\ReleaseVxxxxxx Number Event Description Configuration System Security Improving Security Page Configuration Script Management Event Triggering Configuration Script ManagementRun Scripts Using IWS VBrick Systems, Inc Run Scripts Using Event Triggers Run Scripts Using the IR Remote ControlSample Script Configuration Script Management Auto Configuration Scripting NotesURL VBrick Systems, Inc SDI Configuration IntroductionConfiguration Encoder Video Configuration Encoder Audio Video Limitations with SDI Video Input SDI LimitationsAudio Limitations with SDI Video Input and SDI Audio Input VBrick Systems, Inc Status Status System InformationGeneral Status Network StatusStatus Network Status Codec InterfaceStatus Network Status Routing Status Encoder Status Status Network Status Network TimeVideo PLX EepromAudio Close CaptioningMulticast Status Reflector StatusStatus Reflector Status General Push ReceiveStatus Jpeg Status VBrick WM Appliance Admin Guide 101 Status Hard Drive Status Hard Drive General Status Hard Drive ArchiverVBrick WM Appliance Admin Guide 103 Status Server Status Encoder Details Status Server StatusStatus Server Status General HTTP/RTSP ServerStatus Push Status Status Server Status Reflector DetailsHttp Push Status Status System Log Config Status FTP Server Status Status System LogStatus System Log System Event Status System Log Traps Status System Log System InfoStatus User Information Status User Information Main BoardStatus User Information Slot1 112 Diagnostics Network Tests Diagnostics Network Tests Ping TestDiagnostics Network Tests Trace Route Test PDUDiagnostics Device Test Trace Route Test ResultsWhen done, reset Configured Operational Mode to Run Diagnostics Hard Drive 118 Maintenance Maintenance Device InformationMaintenance Read/Write Configuration Maintenance Default All ConfigurationMaintenance Read/Write Read From Device Read Configuration Data from Device Maintenance Read/Write Write To Device Sample VBrick Configuration FileMaintenance Usernames & Passwords Write Configuration Data to Device124 Maintenance Usernames & Passwords Change SNMPv3 Passwords User Level Default User Name Default Password Authority126 Maintenance Mode Maintenance Mode Indicators Maintenance Mode FeaturesMaintenance Mode Limitations Maintenance Mode CLI Operation Command Description EntrySubnet mask associated with WM Templates Best Quality Video Encoder Parameter SettingCBR/CFR Audio Encoder Parameter Setting Cable/DSL-300K, High MotionCable/DSL-128K, High Motion Cable/DSL-300K, Low MotionCable/DSL-128K, Low Motion Modem 56K Security & SurveillanceAudio Channels Mono L +R Bit Rate 8000 Sample Frequency KHz Stream Prioritization Stream PrioritizationExample 1 Priority List Non Bitrate ConstrainedBitrate Constrained Example 2 Redundant ListFor Archiving, and Pushing to or Pulling from a WM Server How the WM Appliance Creates Priority ListsFor Group Serving Example 4 Sliding Window BehaviorConfiguring Groups Safe Group ConfigurationsIndex Initiator Device Test Network Tests 144
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